$\frac{tan\:x}{sen\:x\:\left(1+\tan\left(x\right)\right)}$
$\frac{1}{x^2}dx+\frac{1}{y^2}dy=0$
$\left(\sqrt{5a\:+\:\sqrt{20b}}\right)^2$
$\pi\:\:x^6-\pi\:\:y^6$
$dydx\:+\:\left(sen\:x\right)y\:=\:0.$
$7.5\cdot10^5$
$\left(8-7x\right)\left(8+7x\right)$
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